Shadow-producing agent and process for making the same



Y, as described above,

Patented Oct. 4, 1927.

FFIC.

IBERNHARD RAPP, OF DARMSTADT, GERMANY.

SHADOW-PRODUCING AGENT AND PROCESS FOR MAKING THE SAME.

Ho Drawing. Application filed May 17, 1926,

"Kestle (Fortschritte auf dem Gebiete der Rontgenstrahlen, Vol. XI, No. 4, page 271) states that shadows produced by salts of bismuth together with mucilage, such as tragacanth, are useless for all practicalpurposes, and barium sulphate as obtainable in commerce behaves in the same wayas the hismuth salts. Recent experiments have shown that a shadow-producing agent which as 'regards its capability of forming a uniform coating on the wall of the stomach fulfils all modern requirements, may be obtained from commercial barium sulphate and mucilage byanchoring these to paraflin (vide German Letters Patent No. 295,124).

On the other hand, experience has shown that fastidious'patients refuse to take shadow-producing meals prepared in the manner owing to the unpleasant paraffin taste. Now it has been surprising to find that excellent shadow-producing llager and agents in every way fulfilling modern requirements may be obtained without the use of paraflin by mixing shadow-producing substances precipitated cold or'at room temperature, e. g., barium sulphate precipidextroses, levuloses, or some of the higher alcohols, such as erythrite or mannite, and drying rapidly. The dried powder thus obtained is either mixed with dried and powdered mucilage, and stirred inwaterwhen re uired for use, or the fluid mucilage is adde straightaway and a suitable mixture prepared.

Example.

As much barium sulphate, freshly precipitated and freed from excess of moisture as corresponds to 100 parts of the dry precipitate is intimately mixed with 12,5 parts of sugar (powder or fine crystallized). This is thinned down with just enou allow the mixture being sprea in a thin dried at between 70 to 100 C. e preparation thus obtained is finely ground and passed through a sieve.

h water to Serial 110. 109,801, and. in Germany January 19, 1925.

Instead of barium sulphate any other shadow-producing agent precipitated from aqueous solution may be taken.

I claim: V

1. The process for preparing a shadowproducing agent whic consists of freshly precipitating barium sulphate, removing therefrom the excess of moisture, then mixmg intimately finely subdivided sugar, spreading the said mixture in a thin layer, drying the same at a' temperature of between 70 to 100 C., and then finely powdering the dried material and passing through a sieve.

2. The process for preparing a shadowproducingagent which consists of freshly precipitating a shadow-producing salt, removing therefrom the excess of moisture, then mixing intimately therewith, while still moist, a finely subdivided sugar, spreading the said mixture in a same at a temperature of between 70 to 100 C., and then finely powdering the dried material and passing through a sieve.

3. The process for the preparation of shadow-producing agents comprising the steps of precipitating a shadow-producing salt, intimately mixin therewith, when freshly precipitated an while still moist, a sugar. and water in quantity sufficient to produce a semi-fluid mass, then .rapidly drying the same by the additionof finely powdered mucilaginous material.

4. A shadow-producing preparation contherewith, while still moist, a

thin layer, drying they sisting of a mixture of a shadow-producing salt, a sugar, and mucilaginous materiaL' 

